Exercising machine

ABSTRACT

An exercising machine includes a base frame having two positioning plates each of which has equiangularly spaced locating holes, and two crank arms respectively pivoted to the positioning plates. Two dampers are respectively coupled to the crank arms to impart a damping resistance during operation of the crank arms. Two positioning members are respectively movably mounted on the crank arms for selectively engaging into the locating holes of the positioning plates to secure the crank arms at a desired angle. Two spring members are sleeved onto the positioning members for forcing the positioning members into engagement with the locating holes of the positioning plates. Two levers are respectively pivoted to the crank arms for operation by the user to pull the positioning members away from the locating holes of the positioning members through a respective traction member.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to exercising machines and moreparticularly, to such an exercising machine, which uses position-controldevices for enabling the user to quickly adjust the position of crankarms subject to different operation needs.

2. Description of the Related Art

FIG. 6 shows a conventional exercising machine 90. According to thisdesign, the exercising machine 90 comprises a traction mechanism 92. Thetraction mechanism 92 comprises two arms 94 and two control plates 96.The arms 94 each have a positioning member 942. The control plates 96are respectively coupled to one end of each of the arms 94, each havinga plurality of equiangularly spaced through holes 962. By means ofselectively inserting the positioning members 942 into the locatingholes 962 of the control plates 96, the arms 94 are set at apredetermined angle for biasing by the user. Therefore, by means of thetraction mechanism 92, the user can adjust the exercising machine toprovide different biasing angles for exercising the muscles of differentparts of the body.

However, when adjusting the biasing angle of the two arms 94, the usermust leave the exercising machine 90, and then remove the twopositioning members 942 from the control plates 96, and then insert thepositioning members 942 into the selected locating holes 962. Afteradjustment, the user can then return to the exercising machine 90 andoperate the exercising machine 90 again. When wishing to exercise themuscles of a different party of the body, the user must leave theexercising machine 90 and then adjust the arms 94 to the desired angle.The adjustment of this traction mechanism 92 is complicated andinconvenient.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances inview. It is the main object of the present invention to provide anexercising machine, which uses position-control device means forenabling the user to quickly adjust the position of crank arm meanssubject to different operation needs.

To achieve this object of the present invention, the exercising machinecomprises a base frame, damper means, and at least one position-controldevice. The base frame includes at least one positioning plate with aplurality of locating holes and at least one crank arm pivoted to the atleast one positioning plate. The damper means is mounted in the baseframe and coupled to the at least one crank arm for imparting a dampingresistance to the at least one crank arm during operation of the atleast one crank arm by the user. The at least one position-controldevice includes a lever pivoted to the at least one crank arm, apositioning member movably mounted on the at least one crank arm andengageable into one locating hole of the at least one positioning plateto secure the crank arm to the positioning plate at a desired angle, anda traction member connected between the lever and the positioning memberfor pulling by the lever to disengage the positioning member from thelocating hole of the positioning plate.

In a preferred embodiment of the present invention, the position-controldevice further comprises a spring member sleeved onto the positioningmember for forcing the positioning member into engagement with onelocating hole of the positioning plate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an exercising machine according to a preferredembodiment of the present invention.

FIG. 2 is a perspective view of a part of the present invention, showingthe structure of the position-control device.

FIG. 3 is a front view of the position-control device before pressing ofthe lever.

FIG. 4 is a front view of the position-control device showing the leverpressed.

FIG. 5 is a schematic drawing showing the exercising machine inoperation.

FIG. 6 is a front view of an exercising machine according to the priorart.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIGS. 1-3, an exercising machine 10 in accordance with thepreferred embodiment of the present invention comprises a base frame 20,two dampers 30, two position-control devices 40, and two spring members50.

The base frame 20 comprises a seat 22 for allowing the user to sit on,and two semicircular positioning plates 24 bilaterally connected to thebottom side of the seat 22. Each semicircular positioning plate 24 has aplurality of equiangularly spaced locating holes 242. The base frame 20further comprises two crank arms 26 respectively pivoted to thesemicircular positioning plates 24. Therefore, the user can bias thecrank arms 26 relative to the semicircular positioning plates 24.

The two dampers 30 are respectively provided at two opposite lateralsides of the base frame 20. The crank arms 26 are respectively coupledto the dampers 30. When biasing the crank arms 26, the dampers 30 imparta damping resistance to the crank arms 26 respectively.

The position-control devices 40 are respectively mounted on the crankarms 26 of the base frame 20 each comprising a lever 42, two locatingplates 44, a traction member 46, and a positioning member 48. The lever42 is pivotally mounted on the associating crank arm 26 for operation bythe user. The two locating plates 44 are welded to one end of theassociating crank arm 26, and spaced from each other at a distance. Thetraction member 46 according to this embodiment is a steel cable havingone end, namely, the front end connected to one end of the lever 42 andthe other end, namely, the rear end inserted through the two locatingplates 44 and connected to the positioning member 48. According to thisembodiment, the positioning member 48 is a pin engaged into one locatinghole 242 of the associating semicircular positioning plate 24 to holdthe associating crank arm 26 at a predetermined angle for biasing by theuser. By means of operating the lever 42 to move the traction member 46,the positioning member 48 is engaged into one locating hole 242 of theassociating semicircular positioning plate 24 or disengaged from thecorresponding locating hole 242.

The spring members 50 are coil springs respectively sleeved onto thepositioning members 48 of the position-control devices 40, each havingone end stopped at a part of the associating positioning member 48 andthe other end stopped against one locating plate 44 of the associatingposition-control device 40. The spring members 50 impart an outwardpressure to the associating positioning members 48, forcing theassociating positioning members 48 into engagement with the associatingsemicircular positioning plates 24.

Referring to FIG. 4, before using the exercising machine 10 to exercisethe muscles of a different part of the body, the user must adjust thecrank arms 26 to the proper angle. At this time, hold the levers 26 withthe two hands and then press the levers 26 to pull the associatingtraction members 46 and to further disengage the associating positioningmembers 48 from the corresponding locating holes 242 of the associatingsemicircular positioning plate 24, and then bias the crank arms 26 tothe desired angle as shown in FIG. 5, and then release the levers 42 forenabling the spring members 50 to force the positioning members 48 intothe newly selected locating holes 242 respectively, thereby holding thecrank arms 26 at the desired angle for operation to exercise the musclesof the body.

Therefore, the exercising machine 10 of the present invention allows theuser to quickly adjust the crank arms 26 to the desired position whenthe user is sitting on the seat 22 of the exercising machine 10, i.e.,the user can adjust the angular position of the crank arms 26 withoutleaving the exercising machine 10.

1. An exercising machine comprising: a base frame having a positioningplate with a plurality of locating holes and a crank arm pivoted to saidpositioning plate; a damper mounted in said base frame and coupled tosaid crank arm for imparting a damping resistance to said crank armduring operation of said crank arm by the user; and a position-controldevice having a lever pivoted to said crank arm, a positioning memberfor engaging into one of the locating holes of said positioning plate tosecure the crank arm to the positioning plate, and a traction memberconnected between said lever and said positioning member for pulling bysaid lever to disengage said positioning member from the locating holeof the positioning plate.
 2. The exercising machine as claimed in claim1, wherein the position-control device further comprises a spring membersleeved onto the positioning member for forcing the positioning memberinto engagement with one locating hole of the positioning plate.
 3. Theexercising machine as claimed in claim 1, wherein said position-controldevice further comprises two locating plates respectively affixed tosaid crank arm; said traction member is inserted through the locatingplates of the position-control device.
 4. An exercising machinecomprising: a base frame having a positioning plate with a plurality oflocating holes and a crank arm pivoted to said positioning plate; and aposition-control device having a lever pivoted to said crank arm, apositioning member movably mounted on said crank arm and engageable intoone of the locating holes of said positioning plate to secure the crankarm to the positioning plate, a traction member connected between saidlever and said positioning member for pulling by said lever to disengagesaid positioning member from the locating hole of the positioning plate,and a spring member sleeved onto the positioning member for forcing thepositioning member into engagement with one of the locating holes of thepositioning plate.
 5. The exercising machine as claimed in claim 4,wherein said position-control device further comprises two locatingplates respectively affixed to said crank arm; said traction member isinserted through the locating plates of the position-control device.